Year	% of total labor force
1991	0.27421150481789613
1992	0.27211550759066205
1993	0.2702863413500262
1994	0.26844004123239035
1995	0.3109847821818159
1996	0.3087290946298779
1997	0.30385528432360676
1998	0.30171735431268876
1999	0.2616861949267539
2000	0.25842753734923984
2001	0.25700202003587747
2002	0.25484308037326014
2003	0.2527171303464415
2004	0.16628683981006717
2005	0.24680246835375347
2006	0.24433349893714928
2007	0.24185064110574112
2008	0.23938774191128767
2009	0.23042150036150935
2010	0.23323855441546132
2011	0.2283510312106639
2012	0.2251728977762784
2013	0.21784446367154905
2014	0.25907650116058767
2015	0.24478935698447896
2016	0.280433415167827
2017	0.2785203051746984
2018	0.412208864499672
2019	0.40343375920249214
2020	0.4127850538787691